CN109011720B - Efficient defoaming agent for sewage treatment and preparation method and application thereof - Google Patents
Efficient defoaming agent for sewage treatment and preparation method and application thereof Download PDFInfo
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- CN109011720B CN109011720B CN201810978528.4A CN201810978528A CN109011720B CN 109011720 B CN109011720 B CN 109011720B CN 201810978528 A CN201810978528 A CN 201810978528A CN 109011720 B CN109011720 B CN 109011720B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0409—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing Si-atoms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0422—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing S-atoms
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
Abstract
The invention discloses a high-efficiency defoaming agent for sewage treatment and a preparation method and application thereof, wherein the high-efficiency defoaming agent comprises the following raw materials: the raw materials are easy to obtain, and the preparation cost is reduced; the prepared defoaming agent has good defoaming performance and foam inhibition performance in water treatment, can effectively control foam, improve sewage treatment capacity, reduce pollution and is very environment-friendly; and also has good defoaming performance and foam inhibiting performance in fermentation, and improves the fermentation efficiency.
Description
Technical Field
The invention relates to a sewage treatment auxiliary agent, in particular to a high-efficiency defoaming agent for sewage treatment and a preparation method and application thereof.
Background
Sewage treatment is a process of purifying sewage to meet the water quality requirement of discharging the sewage into a certain water body or reusing the sewage. The sewage treatment is generally classified into production sewage treatment and domestic sewage treatment according to the classification of sewage sources. The production sewage comprises industrial sewage, agricultural sewage, medical sewage and the like, and the domestic sewage is sewage generated in daily life and refers to complex mixtures of various forms of inorganic matters and organic matters. Because the sewage has complex components, especially the domestic sewage can generate a large amount of foams in the treatment process, and the sewage treatment efficiency is seriously influenced, a defoaming agent needs to be added.
At present, the defoaming agent for sewage treatment mainly comprises organosilicon and polyether, the organosilicon is quick in defoaming but poor in foam inhibition capability, the polyether defoaming agent is good in foam inhibition capability but poor in defoaming capability, and a part of treatment plants adopt organosilicon and polyether for compounding and mixing, so that the dosage is large, the use cost is high, and therefore the low-cost defoaming agent with good defoaming and foam inhibition performances is needed.
Disclosure of Invention
The invention aims to provide a high-efficiency defoaming agent for sewage treatment, and a preparation method and application thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a high-efficiency defoaming agent for sewage treatment comprises the following components in parts by weight: 30-40 parts of polydimethylsiloxane, 2-6 parts of hydrophobic fumed silica, 20-30 parts of polyether modified silicone oil, 5-10 parts of sodium polydithio dipropyl sulfonate, 4-8 parts of isopropyl myristate, 5-10 parts of n-butyl oleate, 1-5 parts of menthol and 40-50 parts of deionized water;
the polydimethylsiloxane is hydroxyl-terminated polydimethylsiloxane, the viscosity of the polydimethylsiloxane is 1000-2000 Cst, and the hydroxyl content is 8% -10%;
the appearance of the polyether modified silicone oil is light yellow transparent oily liquid; the density is 1.03g/ml at 25 ℃; viscosity was 2000-3000 Cst.
As a further scheme of the invention: the paint comprises the following components in parts by weight: 32-38 parts of polydimethylsiloxane, 3-5 parts of hydrophobic fumed silica, 23-27 parts of polyether modified silicone oil, 6-9 parts of sodium polydithio-dipropyl sulfonate, 5-7 parts of isopropyl myristate, 6-8 parts of n-butyl oleate, 2-4 parts of menthol and 42-47 parts of deionized water.
As a further scheme of the invention: the paint comprises the following components in parts by weight: 35 parts of polydimethylsiloxane, 4 parts of hydrophobic fumed silica, 25 parts of polyether modified silicone oil, 8 parts of sodium polydithio-dipropyl sulfonate, 6 parts of isopropyl myristate, 7 parts of n-butyl oleate, 3 parts of menthol and 45 parts of deionized water.
A preparation method of a high-efficiency defoaming agent for sewage treatment comprises the following steps:
(1) weighing hydrophobic fumed silica and sodium polydithio-dipropyl sulfonate according to the parts by weight, performing planetary ball milling for 1-2 hours in a tank, then sieving with a 200-mesh sieve after grinding, placing in a vacuum drying oven, and drying for 2 hours at 60-80 ℃;
(2) weighing polydimethylsiloxane and polyether modified silicone oil according to the weight parts, adding the polydimethylsiloxane and the polyether modified silicone oil into a stirring kettle, heating to 190-;
(3) heating 1/2 deionized water to 60-70 deg.C, sequentially adding isopropyl myristate, n-butyl oleate and menthol under stirring, and stirring for 30-60min to obtain mixture B;
(4) adding the mixture B into the mixture A slowly, and continuously stirring at 70-75 ℃ for 60-90min, wherein the rest deionized water is added slowly;
(5) and (4) passing the obtained substance in the step (4) through a homogenizer while the substance is hot, and cooling to obtain a finished product.
As a further scheme of the invention: the ball milling time in the step (1) is 1.5h, and the drying temperature is 70 ℃.
As a further scheme of the invention: in the step (2), the stirring speed is 400 r/min, the stirring time is 5h, and the stirring temperature is 200 ℃.
As a further scheme of the invention: in the step (3), the stirring temperature is 65 ℃, and the stirring time is 45 ℃.
As a further scheme of the invention: and (4) stirring time in the step (4) is 75 min.
An application of a high-efficiency defoaming agent for sewage treatment in the water treatment industry.
An application of a high-efficiency defoaming agent for sewage treatment in the fermentation industry.
Compared with the prior art, the invention has the beneficial effects that:
the environment-friendly mask base material is prepared from polydimethylsiloxane, hydrophobic fumed silica, polyether modified silicone oil, sodium polydithio-dipropyl sulfonate, isopropyl myristate, n-butyl oleate, menthol and deionized water, and is easy to obtain, so that the preparation cost is reduced; the prepared defoaming agent has good defoaming performance and foam inhibition performance in water treatment, can effectively control foam, improve sewage treatment capacity, reduce pollution and is very environment-friendly; and also has good defoaming performance and foam inhibiting performance in fermentation, and improves the fermentation efficiency.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Example 1
A high-efficiency defoaming agent for sewage treatment comprises the following components in parts by weight: 30 parts of polydimethylsiloxane, 2 parts of hydrophobic fumed silica, 20 parts of polyether modified silicone oil, 5 parts of sodium polydithio-dipropyl sulfonate, 4 parts of isopropyl myristate, 5 parts of n-butyl oleate, 1 part of menthol and 40 parts of deionized water;
the polydimethylsiloxane is hydroxyl-terminated polydimethylsiloxane, the viscosity of the polydimethylsiloxane is 1000-2000 Cst, and the hydroxyl content is 8% -10%;
the appearance of the polyether modified silicone oil is light yellow transparent oily liquid; the density is 1.03g/ml at 25 ℃; viscosity was 2000-3000 Cst.
A preparation method of a high-efficiency defoaming agent for sewage treatment comprises the following steps:
(1) weighing hydrophobic fumed silica and sodium polydithio-dipropyl sulfonate according to the parts by weight, performing planetary ball milling for 1 hour in a tank, then sieving by a 200-mesh sieve after grinding, placing in a vacuum drying oven, and drying for 2 hours at 60 ℃;
(2) weighing polydimethylsiloxane and polyether modified silicone oil according to parts by weight, adding the polydimethylsiloxane and the polyether modified silicone oil into a stirring kettle, heating to 190 ℃, adding the dried mixture obtained in the step (1) and menthol, filling nitrogen under the condition of 300 revolutions per minute, stirring for 4 hours, and cooling to 70 ℃ to obtain a mixture A;
(3) heating 1/2 deionized water to 60 deg.C, sequentially adding isopropyl myristate, n-butyl oleate and menthol under stirring, and stirring for 30min to obtain mixture B;
(4) adding the mixture B into the mixture A slowly, and continuing stirring at 70 ℃ for 60min, wherein the rest deionized water is added slowly;
(5) and (4) passing the obtained substance in the step (4) through a homogenizer while the substance is hot, and cooling to obtain a finished product.
Example 2
A high-efficiency defoaming agent for sewage treatment comprises the following components in parts by weight: 32 parts of polydimethylsiloxane, 3 parts of hydrophobic fumed silica, 23 parts of polyether modified silicone oil, 6 parts of sodium polydithio-dipropyl sulfonate, 5 parts of isopropyl myristate, 6 parts of n-butyl oleate, 2 parts of menthol and 42 parts of deionized water;
the polydimethylsiloxane is hydroxyl-terminated polydimethylsiloxane, the viscosity of the polydimethylsiloxane is 1000-2000 Cst, and the hydroxyl content is 8% -10%;
the appearance of the polyether modified silicone oil is light yellow transparent oily liquid; the density is 1.03g/ml at 25 ℃; viscosity was 2000-3000 Cst.
A preparation method of a high-efficiency defoaming agent for sewage treatment comprises the following steps:
(1) weighing hydrophobic fumed silica and sodium polydithio-dipropyl sulfonate according to parts by weight, performing planetary ball milling for 1.3 hours in a tank, then sieving with a 200-mesh sieve after grinding, placing in a vacuum drying oven, and drying for 2 hours at 62 ℃;
(2) weighing polydimethylsiloxane and polyether modified silicone oil according to parts by weight, adding the polydimethylsiloxane and the polyether modified silicone oil into a stirring kettle, heating to 195 ℃, adding the dried mixture obtained in the step (1) and menthol, filling nitrogen under the condition of 350 revolutions per minute, stirring for 4.5 hours, and cooling to 72 ℃ to obtain a mixture A;
(3) heating 1/2 deionized water to 63 ℃, sequentially adding isopropyl myristate, n-butyl oleate and menthol under stirring, and continuously stirring for 40min to obtain a mixture B;
(4) adding the mixture B into the mixture A slowly, and continuing stirring at 72 ℃ for 65min, wherein the rest deionized water is added slowly;
(5) and (4) passing the obtained substance in the step (4) through a homogenizer while the substance is hot, and cooling to obtain a finished product.
Example 3
A high-efficiency defoaming agent for sewage treatment comprises the following components in parts by weight: 35 parts of polydimethylsiloxane, 4 parts of hydrophobic fumed silica, 25 parts of polyether modified silicone oil, 8 parts of sodium polydithio-dipropyl sulfonate, 6 parts of isopropyl myristate, 7 parts of n-butyl oleate, 3 parts of menthol and 45 parts of deionized water;
the polydimethylsiloxane is hydroxyl-terminated polydimethylsiloxane, the viscosity of the polydimethylsiloxane is 1000-2000 Cst, and the hydroxyl content is 8% -10%;
the appearance of the polyether modified silicone oil is light yellow transparent oily liquid; the density is 1.03g/ml at 25 ℃; viscosity was 2000-3000 Cst.
A preparation method of a high-efficiency defoaming agent for sewage treatment comprises the following steps:
(1) weighing hydrophobic fumed silica and sodium polydithio-dipropyl sulfonate according to parts by weight, performing planetary ball milling for 1.5 hours in a tank, then sieving with a 200-mesh sieve after grinding, placing in a vacuum drying oven, and drying for 2 hours at 70 ℃;
(2) weighing polydimethylsiloxane and polyether modified silicone oil according to parts by weight, adding the polydimethylsiloxane and the polyether modified silicone oil into a stirring kettle, heating to 200 ℃, adding the dried mixture obtained in the step (1) and menthol, filling nitrogen gas under the condition of 400 revolutions per minute, stirring for 5 hours, and cooling to 73 ℃ to obtain a mixture A;
(3) heating 1/2 deionized water to 65 deg.C, sequentially adding isopropyl myristate, n-butyl oleate and menthol under stirring, and stirring for 45min to obtain mixture B;
(4) adding the mixture B into the mixture A slowly, and continuing stirring at 73 ℃ for 75min, wherein the rest deionized water is added slowly;
(5) and (4) passing the obtained substance in the step (4) through a homogenizer while the substance is hot, and cooling to obtain a finished product.
Example 4
A high-efficiency defoaming agent for sewage treatment comprises the following components in parts by weight: 38 parts of polydimethylsiloxane, 5 parts of hydrophobic fumed silica, 27 parts of polyether modified silicone oil, 9 parts of sodium polydithio-dipropyl sulfonate, 7 parts of isopropyl myristate, 8 parts of n-butyl oleate, 4 parts of menthol and 47 parts of deionized water;
the polydimethylsiloxane is hydroxyl-terminated polydimethylsiloxane, the viscosity of the polydimethylsiloxane is 1000-2000 Cst, and the hydroxyl content is 8% -10%;
the appearance of the polyether modified silicone oil is light yellow transparent oily liquid; the density is 1.03g/ml at 25 ℃; viscosity was 2000-3000 Cst.
A preparation method of a high-efficiency defoaming agent for sewage treatment comprises the following steps:
(1) weighing hydrophobic fumed silica and sodium polydithio-dipropyl sulfonate according to parts by weight, performing planetary ball milling for 1.8 hours in a tank, then sieving with a 200-mesh sieve after grinding, placing in a vacuum drying oven, and drying for 2 hours at 75 ℃;
(2) weighing polydimethylsiloxane and polyether modified silicone oil according to parts by weight, adding the polydimethylsiloxane and the polyether modified silicone oil into a stirring kettle, heating to 205 ℃, adding the dried mixture obtained in the step (1) and menthol, filling nitrogen under the condition of 450 revolutions per minute, stirring for 5.5 hours, and cooling to 74 ℃ to obtain a mixture A;
(3) heating 1/2 deionized water to 68 deg.C, sequentially adding isopropyl myristate, n-butyl oleate and menthol under stirring, and stirring for 50min to obtain mixture B;
(4) adding the mixture B into the mixture A slowly, and continuing stirring at 74 ℃ for 85min, wherein the rest deionized water is added slowly;
(5) and (4) passing the obtained substance in the step (4) through a homogenizer while the substance is hot, and cooling to obtain a finished product.
Example 5
A high-efficiency defoaming agent for sewage treatment comprises the following components in parts by weight: 40 parts of polydimethylsiloxane, 4 parts of hydrophobic fumed silica, 30 parts of polyether modified silicone oil, 10 parts of sodium polydithio-dipropyl sulfonate, 8 parts of isopropyl myristate, 10 parts of n-butyl oleate, 5 parts of menthol and 50 parts of deionized water;
the polydimethylsiloxane is hydroxyl-terminated polydimethylsiloxane, the viscosity of the polydimethylsiloxane is 1000-2000 Cst, and the hydroxyl content is 8% -10%;
the appearance of the polyether modified silicone oil is light yellow transparent oily liquid; the density is 1.03g/ml at 25 ℃; viscosity was 2000-3000 Cst.
A preparation method of a high-efficiency defoaming agent for sewage treatment comprises the following steps:
(1) weighing hydrophobic fumed silica and sodium polydithio-dipropyl sulfonate according to parts by weight, performing planetary ball milling for 2 hours in a tank, then sieving by a 200-mesh sieve after grinding, placing in a vacuum drying oven, and drying for 2 hours at 80 ℃;
(2) weighing polydimethylsiloxane and polyether modified silicone oil according to parts by weight, adding the polydimethylsiloxane and the polyether modified silicone oil into a stirring kettle, heating to 210 ℃, adding the dried mixture obtained in the step (1) and menthol, filling nitrogen gas under the condition of 500 revolutions per minute, stirring for 6 hours, and cooling to 70-75 ℃ to obtain a mixture A;
(3) heating 1/2 deionized water to 70 deg.C, sequentially adding isopropyl myristate, n-butyl oleate and menthol under stirring, and stirring for 60min to obtain mixture B;
(4) adding the mixture B into the mixture A slowly, and continuing stirring for 90min at 75 ℃, wherein the rest deionized water is added slowly;
(5) and (4) passing the obtained substance in the step (4) through a homogenizer while the substance is hot, and cooling to obtain a finished product.
Comparative example 1
The preparation process is the same as that of example 3 except that the raw materials do not contain sodium polydithio-dipropyl sulfonate.
Comparative example 2
The procedure was as in example 3 except that the starting material contained no isopropyl myristate.
Comparative example 3
The procedure was as in example 3 except that the starting materials contained no sodium polydithio-dipropyl sulfonate and no isopropyl myristate.
Comparative example 4
The starting materials were as in example 3 and the preparation method was: mixing hydrophobic fumed silica with silicone oil, heating to obtain silicon paste, emulsifying at 70 deg.C, and homogenizing.
Experimental example 1
The defoaming agents of examples 1-5 and comparative examples 1-4 were subjected to a test of defoaming performance of sewage, wherein the foaming liquid is the sewage taken from a sewage treatment plant at present, and the method for testing the defoaming performance comprises the following steps: adding 25mL of foaming liquid into a 100mL measuring cylinder with a plug, oscillating for 50 times up and down to increase the foam to 100mL, then adding a defoaming agent with the quality of 0.01% of the foaming liquid, and simultaneously starting a stopwatch to record the disappearance time of the foam (the shorter the time, the better the defoaming performance); the foam inhibition performance test method comprises the following steps: 100ml of foaming solution and defoamer (0.1% of the foaming solution) were added to a 500ml measuring cylinder equipped with an air-blowing device, the air-blowing device was turned on, and the time for the foam to rise to 500ml was recorded (the longer the time, the better the foam suppressing performance), and the test results are shown in Table 1.
TABLE 1
| Item | Defoaming time(s) | Bubble suppressing time(s) |
| Example 1 | 6 | 308 |
| Example 2 | 4 | 312 |
| Example 3 | 3 | 325 |
| Example 4 | 5 | 315 |
| Example 5 | 7 | 302 |
| Comparative example 1 | 25 | 245 |
| Comparative example 2 | 18 | 262 |
| Comparative example 3 | 50 | 155 |
| Comparative example 4 | 12 | 286 |
Experimental example 2
Defoaming performance test, defoaming, and foam suppressing effect evaluation methods for the defoamers of examples 1 to 5 and comparative examples 1 to 4 in fermentation: adding 100ml of foaming liquid (taking 10% soybean meal filtrate as the foaming liquid) into a 500ml measuring cylinder, then blowing air from the bottom of the measuring cylinder through an air blowing head fully distributed with micropores at a speed of 50L/h, closing an air blowing device when the foam reaches 500ml, adding 0.01g of defoaming agent into the measuring cylinder, and recording the time of the foam until the liquid level is reached as defoaming time (the shorter the time is, the better the defoaming performance is); after aeration was continued for 10 minutes after the foam had completely disappeared, the amount of foam was measured (the less foam, the better the foam suppressing property), and the test results are shown in Table 2.
TABLE 2
| Item | Defoaming time(s) | Amount of foam (ml) |
| Example 1 | 14 | 231 |
| Example 2 | 13 | 222 |
| Example 3 | 11 | 215 |
| Example 4 | 13 | 225 |
| Example 5 | 15 | 236 |
| Comparative example 1 | 30 | 278 |
| Comparative example 2 | 26 | 263 |
| Comparative example 3 | 59 | 345 |
| Comparative example 4 | 19 | 245 |
While the preferred embodiments of the present invention have been described in detail, it is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of the present invention by those skilled in the art.
Claims (10)
1. The efficient defoaming agent for sewage treatment is characterized by comprising the following components in parts by weight: 30-40 parts of polydimethylsiloxane, 2-6 parts of hydrophobic fumed silica, 20-30 parts of polyether modified silicone oil, 5-10 parts of sodium polydithio dipropyl sulfonate, 4-8 parts of isopropyl myristate, 5-10 parts of n-butyl oleate, 1-5 parts of menthol and 40-50 parts of deionized water;
the polydimethylsiloxane is hydroxyl-terminated polydimethylsiloxane, the viscosity of the polydimethylsiloxane is 1000-2000 Cst, and the hydroxyl content is 8% -10%;
the appearance of the polyether modified silicone oil is light yellow transparent oily liquid; the density is 1.03g/ml at 25 ℃; viscosity was 2000-3000 Cst.
2. The efficient defoaming agent for sewage treatment as claimed in claim 1, which is characterized by comprising the following components in parts by weight: 32-38 parts of polydimethylsiloxane, 3-5 parts of hydrophobic fumed silica, 23-27 parts of polyether modified silicone oil, 6-9 parts of sodium polydithio-dipropyl sulfonate, 5-7 parts of isopropyl myristate, 6-8 parts of n-butyl oleate, 2-4 parts of menthol and 42-47 parts of deionized water.
3. The efficient defoaming agent for sewage treatment as claimed in claim 1, which is characterized by comprising the following components in parts by weight: 35 parts of polydimethylsiloxane, 4 parts of hydrophobic fumed silica, 25 parts of polyether modified silicone oil, 8 parts of sodium polydithio-dipropyl sulfonate, 6 parts of isopropyl myristate, 7 parts of n-butyl oleate, 3 parts of menthol and 45 parts of deionized water.
4. A method for preparing the high-efficiency defoaming agent for sewage treatment according to any one of claims 1 to 3, which is characterized by comprising the following steps:
(1) weighing hydrophobic fumed silica and sodium polydithio-dipropyl sulfonate according to the parts by weight, performing planetary ball milling for 1-2 hours in a tank, then sieving with a 200-mesh sieve after grinding, placing in a vacuum drying oven, and drying for 2 hours at 60-80 ℃;
(2) weighing polydimethylsiloxane and polyether modified silicone oil according to the weight parts, adding the polydimethylsiloxane and the polyether modified silicone oil into a stirring kettle, heating to 190-;
(3) heating 1/2 deionized water to 60-70 deg.C, sequentially adding isopropyl myristate, n-butyl oleate and menthol under stirring, and stirring for 30-60min to obtain mixture B;
(4) adding the mixture B into the mixture A slowly, and continuously stirring at 70-75 ℃ for 60-90min, wherein the rest deionized water is added slowly;
(5) and (4) passing the obtained substance in the step (4) through a homogenizer while the substance is hot, and cooling to obtain a finished product.
5. The method for preparing the high-efficiency antifoaming agent for sewage treatment according to claim 4, wherein the ball milling time in the step (1) is 1.5h, and the drying temperature is 70 ℃.
6. The method for preparing the high-efficiency antifoaming agent for sewage treatment according to claim 4, wherein the stirring speed in the step (2) is 400 rpm, the stirring time is 5h, and the stirring temperature is 200 ℃.
7. The method for preparing the high-efficiency antifoaming agent for sewage treatment according to claim 4, wherein the stirring temperature in the step (3) is 65 ℃ and the stirring time is 45 ℃.
8. The method for preparing the high-efficiency antifoaming agent for sewage treatment according to claim 4, wherein the stirring time in the step (4) is 75 min.
9. Use of the high-efficiency antifoaming agent for sewage treatment as claimed in any of claims 1 to 3 in the field of water treatment.
10. Use of the high-efficiency antifoaming agent for sewage treatment according to any of claims 1 to 3 in the field of fermentation.
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